Reddit seems to analyze images with an Ai to index words found in it

Reddit seems to use Ai to analyze images, so the content can be indexed by the search. In example I searched for my name (which is also used for the my blog) to see if there are recent posts with "thingsiplay", because I saw some spike in the stats. But what I instead found is a screenshot of a comment from me made in YouTube. There is no text attached to the post or title, so it must have analyzed the content, right?

https://www.reddit.com/search/?q=thingsiplay&t=week results in

and the post is

Or did I miss something and I make myself a fool here? Does any other community software or forum do this? Is this covered in their User Agreement?